/*
 *  Copyright 2004 Clinton Begin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.ibatis.sqlmap.engine.datasource;

import com.ibatis.sqlmap.client.SqlMapException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;

/**
 * DataSourceFactory implementation for JNDI
 */
public class JndiDataSourceFactory implements DataSourceFactory {

    private DataSource dataSource;

    public void initialize(Map properties) {
        try {
            InitialContext initCtx = null;
            Hashtable context = getContextProperties(properties);

            if (context == null) {
                initCtx = new InitialContext();
            } else {
                initCtx = new InitialContext(context);
            }

            if (properties.containsKey("DataSource")) {
                dataSource = (DataSource) initCtx.lookup((String) properties.get("DataSource"));
            } else if (properties.containsKey("DBJndiContext")) { // LEGACY --Backward compatibility        
                dataSource = (DataSource) initCtx.lookup((String) properties.get("DBJndiContext"));
            } else if (properties.containsKey("DBFullJndiContext")) { // LEGACY --Backward compatibility
                dataSource = (DataSource) initCtx.lookup((String) properties.get("DBFullJndiContext"));
            } else if (properties.containsKey("DBInitialContext") && properties.containsKey("DBLookup")) { // LEGACY --Backward compatibility
                Context ctx = (Context) initCtx.lookup((String) properties.get("DBInitialContext"));
                dataSource = (DataSource) ctx.lookup((String) properties.get("DBLookup"));
            }

        } catch (NamingException e) {
            throw new SqlMapException("There was an error configuring JndiDataSourceTransactionPool. Cause: " + e, e);
        }
    }

    public DataSource getDataSource() {
        return dataSource;
    }

    private static Hashtable getContextProperties(Map allProps) {
        final String PREFIX = "context.";
        Hashtable contextProperties = null;
        Iterator keys = allProps.keySet().iterator();
        while (keys.hasNext()) {
            String key = (String) keys.next();
            String value = (String) allProps.get(key);
            if (key.startsWith(PREFIX)) {
                if (contextProperties == null) {
                    contextProperties = new Properties();
                }
                contextProperties.put(key.substring(PREFIX.length()), value);
            }
        }
        return contextProperties;
    }

}
